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La substituted Sr2MnO4 as a possible cathode material in SOFC

Abstract : Sr2−xLaxMnO4+δ (x = 0.4, 0.5, 0.6) oxides were studied as the cathode material for solid oxide fuel cells (SOFC). The reactivity tests indicated that no reaction occurred between Sr2−xLaxMnO4+δ and CGO at annealing temperature of 1000 ◦C, and the electrode formed good contact with the electrolyte after being sintered at 1000 ◦C for 4 h. The total electrical conductivity, which has strong effect on the electrode properties, was determined in a temperature range from 100 to 800 ◦C. The maximum value of 5.7 S cm−1 was found for the x = 0.6 phase at 800 ◦Cin air. The cathode polarization and AC impedance results showed that Sr1.4La0.6MnO4+δ exhibited the lowest cathode overpotential. The area specific resistance (ASR) was 0.39_cm2 at 800 ◦C in air. The charge transfer process is the rate-limiting step for oxygen reduction reaction on Sr1.4La0.6MnO4+δ electrode.
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Submitted on : Thursday, November 12, 2009 - 4:32:20 PM
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Liping Sun, Li-Hua Huo, Zhao Hui, Li Qiang, Christophe Pijolat. La substituted Sr2MnO4 as a possible cathode material in SOFC. Journal of Power Sources, Elsevier, 2008, 179 (1), pp.96-100. ⟨10.1016/j.jpowsour.2007.12.090⟩. ⟨emse-00431638⟩



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